JP6172805B2 - Foam dispenser - Google Patents

Description

  The present invention relates to a foam dispenser, and more particularly, to a foam dispenser that is used by being attached to a mouth neck portion of a container body and that discharges the contained content liquid into a foam by mixing it with air.

  For example, by containing liquid cleaning agents or hair preparations, and pressing the pump head while the container is left in place, the liquid content is made foamy without the need for manual stirring. Various foam discharge containers such as pump former containers have been developed. In such a foam discharge container, a foam discharger is mounted on the mouth neck of the container body to discharge the content liquid into a foam by mixing it with air. For example, the foam discharger includes a piston (liquid piston) that sucks, pressurizes, and discharges the content liquid, and a piston that sucks, pressurizes, and discharges air (on the base cap portion attached to the mouth of the container body) There is provided a pump composed of a cylinder portion in which air pistons) are respectively concentrically arranged in series. Then, each piston of the pump is operated by pushing the pump head part protruding above the base cap part, and the liquid and air are pressurized and discharged in the cylinder part, and mixed with each other in the merging space. It is the structure which makes it foam-like by letting bubble production | generation members, such as pass, and discharges the content liquid outside (for example, refer patent document 1).

  However, the conventional foam discharger has a structure in which the content liquid is mixed with air to be foamed and discharged from the discharge port only when the operation of pushing the pump head part is performed. When the pump head is pushed back upward by the action of an urging means such as a spring for returning the pump head to its original state after being pushed in, the liquid content is made to be foamed and discharged to the outside. There was no function.

  On the other hand, the second cylinder for liquid supply is concentrically provided in the first cylinder for air supply, and the specially configured vertical movement member can suck up and mix the gas and liquid when the vertical movement member descends and rises. By configuring the foaming layer to be foamed by the foaming layer provided downstream from the nozzle and ejecting it from the nozzle, it is possible to constantly eject foam as the nozzle head (corresponding to the pump head of the present application) moves up and down. There has been proposed a foam ejection container (corresponding to the foam ejector of the present application), which is said to be capable of efficiently ejecting foam (see Patent Document 2).

JP 7-315463 A Japanese Utility Model Publication No. 6-49352

  However, the foam ejection container of Patent Document 2 (corresponding to the foam discharger of the present application) can always eject foam as the nozzle head (corresponding to the pump head of the present application) moves up and down, and efficiently ejects foam. However, the amount of foam discharged during one reciprocating movement of the nozzle head is approximately the same as the amount of foam discharged in the forward path into which the pump head of a conventional foam ejector (see, for example, Patent Document 1) is pushed. Yes, the foam could not be discharged efficiently.

  In the present invention, not only in the forward path in which the pump head part is pushed in, but also in the return path in which the pump head part pushed in is pushed back upward by the action of the urging means, the content liquid is mixed with air and discharged in the form of bubbles. Another object of the present invention is to provide a foam discharger that can discharge bubbles corresponding to the reciprocating stroke of the pump head and can discharge bubbles more efficiently than conventional bubble dischargers.

  The present invention has a pump head part that is attached to the mouth part of the container body via a cap part and is provided so as to be able to reciprocate with respect to the cap part, and by performing a pressing operation to the pump head part, The liquid flow path for sending the content liquid to the mixing chamber and the air flow path for sending the air to the mixing chamber are opened, and the content liquid sent to the mixing chamber is foamed and discharged in the foaming flow path from the mixing chamber to the discharge port. A large-diameter air cylinder disposed in the container body, and a small-diameter having an upper diameter-reduced portion and a lower diameter-expanded portion provided continuously from the air cylinder. A cylinder portion including a liquid cylinder, an air piston having an air chamber close outer periphery that slides in close contact with the inner peripheral surface of the air cylinder, and an inner peripheral surface of the upper reduced diameter portion of the liquid cylinder Close contact outer periphery of upper liquid chamber A first liquid piston having a liquid flow path on the inside, and a second liquid piston having a lower liquid chamber adhesion outer peripheral portion that closely contacts and slides along an inner peripheral surface of the lower enlarged portion of the liquid cylinder. The air piston is provided with a cylindrical mounting portion that is slidably mounted along the outer peripheral surface of the first liquid piston, and that projects outward from the cylindrical mounting portion. The air chamber overhanging portion is provided with an air chamber tight outer periphery at the periphery, and by the air chamber overhanging portion, the hollow interior of the air cylinder is divided into a lower air chamber and an upper air chamber. The second liquid piston is slidably mounted along the outer peripheral surface of the portion disposed in the liquid cylinder of the first liquid piston, and has a cutout cylindrical shape having a cutout portion for circulating the content liquid. From the mounting part and the notched cylindrical mounting part A lower end portion of the notch cylindrical mounting portion is provided from the outer peripheral surface of the lower end portion of the first liquid piston. It is an intermediate liquid on-off valve that can be opened and closed in close contact with an intermediate valve seat that protrudes outward, and a lower valve seat that is provided at the lower end of the liquid cylinder at the lower end opening of the first liquid piston. The sliding rod part of the rod-shaped valve body provided with a lower liquid on-off valve at the lower end part that can be opened and closed close to the part is slidable in a state of being liquid tightly adhered along the inner peripheral surface of the first liquid piston. The lower air chamber and the upper air chamber of the air cylinder are respectively formed with vent holes for introducing air into the air chambers, and covers the vent holes so that they can be opened and closed from the inside. Allow air to flow into these air chambers. In addition, check valves are provided to block outflow of air from these air chambers to the outside, and when the pump head portion is pressed, the pump head portion is returned to the original state. The above object is achieved by providing a foam discharger provided with a biasing means for biasing upward.

  According to the foam discharger of the present invention, the liquid content is mixed with air not only in the forward path where the pump head part is pushed, but also in the return path where the pump head part pushed in is pushed back upward by the action of the urging means. It can be discharged in the form of bubbles, and the bubbles corresponding to the reciprocating stroke of the pump head can be discharged, and the bubbles can be discharged more efficiently than the conventional bubble discharger.

It is sectional drawing of the foam discharge container with which the foam discharge device which concerns on preferable one Embodiment of this invention was attached to the neck part of the container main body. It is sectional drawing of the state before pressing the pump head part of the foam discharger which concerns on preferable one Embodiment of this invention. It is sectional drawing of the state which presses a pump head part and pushes a pump head part downward of the foam discharger which concerns on preferable one Embodiment of this invention. It is sectional drawing of the state which pressed the pump head part to the last of the foam discharger which concerns on preferable one Embodiment of this invention. It is sectional drawing of the state of releasing the press of a pump head part and raising a pump head part of the foam dispenser which concerns on preferable one Embodiment of this invention. (A) of a 2nd liquid piston is a perspective view, (b) is sectional drawing.

As shown in FIG. 1, a foam discharger 10 according to a preferred embodiment of the present invention is a pump former that is used by being attached to a foam discharge container 50 that is a so-called pump former container. Similarly, it is attached to the mouth part 52 of the container main body 51 of the foam discharge container 50 and has a function of discharging the content liquid into a foam by mixing it with air. That is, the foam discharger 10 includes liquid pistons 14 and 15 that are attached to a cap portion 11 attached to the neck portion 52 of the container body 51 and perform suction, pressurization, and discharge of the content liquid, and suction and application of air. It has a pump 18 including a cylinder portion 17 in which air pistons 16 that perform pressure and discharge are concentrically arranged in series. The piston members 14, 15, 16 of the pump 18 are actuated by pushing the pump head part 12 protruding above the cap part 11, and the liquid and air are pressurized and discharged in the cylinder part 17, respectively. Are mixed in a mixing chamber 13 provided as a confluence space on the outlet side of the pump, and foamed to be discharged to the outside from the discharge port 12a.
In FIG. 1, the foam discharge container 50 is schematically illustrated with the thickness of the container omitted.

  Moreover, the foam discharger 10 of this embodiment is equipped with the structure explained in full detail below, so that when the pump head part 12 is pressed, not only the forward path in which the pump head part 12 is pushed downward ( Even in the return path in which the pump head 12 that has been pushed in is pushed back upward by the action of the urging means 29 (see FIG. 5), the content liquid is mixed with air and discharged in the form of bubbles. doing.

  And the foam discharger 10 of this embodiment is mounted | worn with the mouth part 52 (refer FIG. 1) of the container main body 51 of the foam discharge container 50 via the cap part 11, as shown in FIGS. The liquid flow paths 40a and 40b (FIG. 3, FIG. 3) which have the pump head part 12 provided so that reciprocation with respect to the part 11 and send the content liquid to the mixing chamber 13 by performing the pressing operation to the pump head part 12 5) and air flow paths 41a and 41b (see FIGS. 3 and 5) for sending air to the mixing chamber 13 are opened, and the content liquid sent to the mixing chamber 13 is transferred from the mixing chamber 13 to the discharge port 12a. A pump former that foams and discharges in a leading foaming flow path 21, and has a large-diameter air cylinder 24 that is preferably disposed inside the neck 52 as the container body 51, and is continuously provided downward from the air cylinder 24. Provided at the top A cylinder portion 17 including a liquid cylinder 28 having a diameter smaller than that of the air cylinder 24, which includes a diameter portion 28 a and a lower diameter enlarged portion 28 b, and an air chamber contact outer peripheral portion 16 a that closely slides along the inner peripheral surface of the air cylinder 24. And a first liquid piston having an inner liquid flow passage 60 provided therein and an upper liquid chamber contact outer peripheral portion 14a that closely slides along the inner peripheral surface of the upper reduced diameter portion 28a of the liquid cylinder 28. 14 and a second liquid piston 15 including a lower liquid chamber contact outer peripheral portion 15a that closely slides along the inner peripheral surface of the lower diameter expanded portion 28b of the liquid cylinder 28.

  As shown in FIG. 2, the air piston 16 is mounted cylindrically so as to be slidable along the outer peripheral surface of the portion (lower guide cylindrical portion 36) disposed in the liquid cylinder 28 of the first liquid piston 14. Part 16b and an air chamber overhanging part 16c provided on the outer peripheral part of the cylindrical mounting part 16b and having an air chamber tight outer peripheral part 16a at the peripheral part. By this air chamber overhanging part 16c, the air cylinder 24 The hollow interior is partitioned into a lower air chamber 24a and an upper air chamber 24b. As shown in FIGS. 6A and 6B, the second liquid piston 15 is slidably mounted along the outer peripheral surface of the first liquid piston 14 and also has a notch 15d for circulating the content liquid. A notched cylindrical mounting portion 15b, and a liquid chamber overhanging portion 15c provided on the outer periphery of the notched cylindrical mounting portion 15b and having a lower liquid chamber adhesion outer peripheral portion 15a provided on the peripheral edge. The lower end portion of the portion 15b is an intermediate liquid on-off valve 15e that is in close contact with an intermediate valve seat portion 14b provided to project outward from the outer peripheral surface of the lower end portion of the first liquid piston 14 so as to be openable and closable.

  The lower end opening of the first liquid piston 14 has a rod-like shape having a lower liquid on-off valve 19a at the lower end that is in close contact with the lower valve seat 28c provided at the lower end of the lower diameter enlarged portion 28b of the liquid cylinder 28. The sliding rod portion 19b of the valve body 19 is slidably inserted in a state of being in liquid-tight contact along the inner peripheral surface of the first liquid piston. The lower air chamber 24a and the upper air chamber 24b of the air cylinder 24 are respectively formed with a lower air chamber vent 25a and an upper air chamber vent 25b for introducing air into the lower air chamber 24a and the upper air chamber 24b. In addition, these vent holes 25a and 25b are covered so as to be openable and closable from the inside, allowing the inflow of air into the air chambers 24a and 24b, and the air from the air chambers 24a and 24b to the outside. Check valves 26a and 26b are provided to block outflow of the gas. In addition, a biasing means 29 is provided for biasing the pump head portion 11 upward so that the pump head portion 11 is returned to the original state when the pump head portion 11 is pressed.

  Further, in the present embodiment, the urging means 29 that urges the pump head portion 11 upward so as to return it to the original state includes an intermediate valve seat portion 14b provided at the lower end portion of the first liquid piston 14, and a rod-like shape. A lower liquid on-off valve 19a provided at the lower end of the valve body 19 is interposed between the lower liquid on-off valve 19a in a compressed state so as to cover the outer periphery of the rod-shaped valve body 19, and the lower end of the lower liquid on-off valve 19a It is a coiled spring member in contact.

  In the present embodiment, the cap portion 11 is mounted by allowing the cylindrical guide stem 23 to stand from the ceiling portion 11a and preferably screwing to the mouth portion 52 of the container body 51 (see FIG. 1). The pump head portion 12 has a hollow pipe 22 that is inserted into the guide stem 23 of the cap portion 11 so as to be relatively displaceable. A discharge port 12a that discharges the foamed content liquid is provided at the upper tip portion. I have. The first liquid piston 14 is integrally connected to the pump head portion 12 with a connecting cylinder 31 having a foam generating member 30 mounted on the upper portion interposed between the pump head portion 12 and the hollow pipe 22. When the pump head 12 is pressed downward while the hollow pipe 22 is inserted into the guide stem 23 (see FIG. 3), the pump head 12 is an intermediate valve seat at the lower end of the first fluid piston 14. 14b and a spring member 29 as an urging means disposed between the lower liquid opening / closing valve 19a at the lower end portion of the rod-shaped valve body 19 and urged upward.

  Further, on the outer side of the hollow pipe 22 of the pump head portion 12, a skirt-like cover 27 arranged concentrically with the outer peripheral surface of the guide stem 23 holds a gap between the outer peripheral surface and the outer peripheral surface. It is provided to slide up and down along. By providing the skirt-shaped cover 27, when the outside air is sucked into the air cylinder 24 through the gap between the hollow pipe 22 and the guide stem 23, these gaps are accompanied by the suction of the outside air. Therefore, it is possible to prevent the water around the pump head portion 19 and the base cap portion 14 from flowing into the air cylinder 24 together with the outside air.

  In the present embodiment, the connecting cylinder 31 that is interposed between the hollow pipe 22 of the pump head portion 12 and the first liquid piston 14 and integrally connects them in the axial direction has an upper end at the lower end portion of the hollow pipe 22. It is a substantially cylindrical part to which the parts are connected. A fitting step 31 a is provided at the upper end of the connection cylinder 31. By fitting this fitting step 31a into a fitting notch 22a formed by notching the inner surface of the lower end of the hollow pipe 22, the hollow pipe 22 and the connecting cylinder 31 are firmly connected. Further, an annular stopper rib 31b is provided on the upper end portion of the connecting cylinder 31 so as to protrude from the fitting step portion 31a to the outside of the hollow pipe 22 and continuously in the circumferential direction. The annular stopper rib 31b is in contact with an annular abutment rib 23a provided to project radially inward from the peripheral edge portion of the tip opening surface of the guide stem 23 of the cap portion 11 so that the first liquid piston 14 and The top dead center of the pump head unit 12 is positioned so that the pump head unit 12 does not come out further upward. The annular stopper rib 31b exerts a sealing function at the top dead center of the pump head portion 12 in a state of being in close contact with the entire circumference of the annular abutment rib 23a. Intrusion into the cap portion 11 is prevented.

  The connecting cylinder 31 is integrally provided with an inner cylindrical portion 32 that extends downward from the upper inner peripheral surface of the connecting cylinder 31 and is arranged concentrically with the connecting cylinder 31. The inner cylindrical portion 32 extends downward in a cylindrical shape from the lower end portion of the base reduced diameter portion 32a and the base reduced diameter portion 32a extending while reducing the diameter obliquely downward from the inner peripheral surface of the connection cylindrical body 31. It consists of a lower cylindrical part 32b. The foam generating member 30 is mounted and locked inside the connecting cylindrical body 31 between the inner cylindrical portion 32 and the fitting stepped portion 31a above the base reduced diameter portion 32a, and the lower cylindrical shape. Below the portion 32b, the ball valve 33 is disposed in a state in which upward movement is prevented by the lower end surface of the lower cylindrical portion 32b. By these, the space inside the inner cylindrical part 32 forms the mixing chamber 13 as a merge space in which the content liquid is mixed with air prior to passing the foam generating member 30.

  Furthermore, the lower part of the inner cylindrical part 32 of the inner cylindrical part 32 in the connecting cylinder 31 has an outer peripheral surface in close contact with the inner peripheral surface of the connecting cylinder 31, and an upper part to be described later of the first liquid piston 14. With the upper end portion of the connecting cylindrical portion 34 inserted until the upper end is brought into contact with the base reduced diameter portion 32 a of the inner cylindrical portion 32, the lower cylindrical portion 32 b of the inner cylindrical portion 32 and the connecting cylindrical body 31 are connected. It is inserted and fitted into the space between them. Thereby, the connection cylinder 31 and the upper connection cylindrical portion 34 of the first liquid piston 14 are firmly connected.

  Furthermore, a contact notch step groove 31c is formed in the lower end portion of the connecting cylinder 31 by cutting out the inner surface of the connecting cylinder 31 over the entire circumference, so that the lower end portion of the upper connecting cylindrical portion 34 of the first liquid piston 14 is provided. It is formed between the outer peripheral surface. An opening / closing ring portion 16d, which will be described later, provided in the air piston 16 is inserted into the contact notch step groove 31c, and the front end surface thereof contacts the notch step surface so as to be separated from the notch step surface. The second air flow path 41b (see FIG. 5) from the upper air chamber 24b to the mixing chamber 13 can be opened and closed.

  In addition, the inner side surface of the portion excluding the notch step surface of the contact notch step groove 31c, the inner side surface of the lower portion of the inner cylindrical portion 32 of the connecting cylindrical body 31 than the reduced diameter portion 32a, and the inner cylindrical shape On the back surface of the portion 32 on the side of the connecting cylinder 31, an air circulation groove 42 through which air is circulated is formed by extending in the vertical direction. By providing these air circulation grooves 42, the open / close ring portion 16 d of the air piston 16 is spaced from the notch step surface of the contact notch step groove 31 c, and the upper air chamber 24 b of the air cylinder 24. A second air flow path 41b (see FIG. 5) extending from the mixing chamber 13 to the mixing chamber 13 is formed by the air circulation groove 42.

  In the present embodiment, the first liquid piston 14 connected integrally with the hollow pipe 22 of the pump head portion 19 via the connecting cylinder 31 is connected to the upper connecting cylindrical portion 34, which is connected in the axial direction, and the intermediate portion. It consists of a guide cylindrical part 35 and a lower guide cylindrical part 36. Inside the upper connecting cylindrical portion 34, the intermediate guide cylindrical portion 35, and the lower guide cylindrical portion 36 is a liquid flow passage 60 through which the content liquid can flow. The upper connecting cylindrical portion 34 is a cylindrical portion having an outer diameter similar to the inner diameter of the connecting cylindrical body 31, and the upper end portion is located between the inner cylindrical portion 32 and the connecting cylindrical body 31 as described above. The outer peripheral surface is brought into close contact with the inner side surface of the connecting cylinder 31 and is inserted and fitted into the connecting cylinder 31 so as to be integrally connected to the connecting cylinder 31. Further, an upper valve seat portion 34a that protrudes inward from the inner peripheral surface of the intermediate portion of the upper connecting cylindrical portion 34 and closes and mounts the ball valve 33 so as to be openable and closable surrounds the central liquid outlet 34b. Is provided. The ball valve 33 is disposed between the upper valve seat portion 34 a and the lower end surface of the lower cylindrical portion 32 b of the inner cylindrical portion 32 provided in the connection cylindrical body 31, so that the inner side of the upper connection cylindrical portion 34. In addition, it is mounted with a play that is slightly movable up and down.

  The intermediate guide cylindrical portion 35 is a cylindrical portion having an outer diameter similar to the inner diameter of the upper connecting cylindrical portion 34, and the outer peripheral surface of the upper end portion is in close contact with the inner peripheral surface of the upper connecting cylindrical portion 34. Thus, the upper end portion is inserted and fitted from the lower end opening of the upper connection cylindrical portion 34, so that the upper end portion is connected to the upper connection cylindrical portion 34 in an integrated manner in the axial direction. At the lower end portion of the intermediate guide cylindrical portion 35, a lower end enlarged diameter portion 35b having an enlarged diameter via a step contact portion 35a is provided. In the outer peripheral portion of the step contact portion 35a, the upper liquid chamber contact outer peripheral portion that is formed integrally with the step contact portion 35a and slides in close contact along the inner peripheral surface of the upper reduced diameter portion 28a of the liquid cylinder 28. 14a is provided.

  On the outer peripheral portion of the intermediate guide cylindrical portion 35 between the step contact portion 35a and the lower end portion of the upper connecting cylindrical portion 34, the intermediate guide cylindrical portion 35 is used as a guide. The cylindrical mounting portion 16b of the air piston 16 is mounted in a state in which it can slide up and down along the outer peripheral surface. Further, the outer diameter of the lower end enlarged diameter portion 35b is the same as the outer diameter of the upper connecting cylindrical portion 34, and the inner diameter of the lower end enlarged diameter portion 35b is the inner diameter of the upper connecting cylindrical portion 34 and the intermediate guide cylindrical portion 35. It is the same as the outer diameter. By inserting and fitting the upper end portion into the lower end enlarged diameter portion 35b with the outer peripheral surface of the upper end portion of the lower guide cylindrical portion 36 in close contact with the inner peripheral surface of the lower end enlarged diameter portion 35b. The lower guide cylindrical portion 36 is connected to the intermediate guide cylindrical portion 35 as an integral unit in the axial direction.

  The lower guide cylindrical portion 36 is a cylindrical portion having an outer diameter similar to the outer diameter of the intermediate guide cylindrical portion 35 and an inner diameter similar to the inner diameter of the intermediate guide cylindrical portion 35. An intermediate valve seat portion 14b is provided at the lower end portion of the lower guide cylindrical portion 36 so as to protrude outward from the outer peripheral surface of the lower guide cylindrical portion 36 in an annular manner in the circumferential direction. An outer peripheral portion of the lower guide cylindrical portion 36 disposed inside the liquid cylinder 28 between the intermediate valve seat portion 14b and the lower end portion of the lower end enlarged diameter portion 35b of the intermediate guide cylindrical portion 35 includes the lower portion Using the guide cylindrical portion 36 as a guide, the notched cylindrical mounting portion 15b of the second liquid piston 15 is mounted in a state in which it can slide up and down along the outer peripheral surface of the lower guide cylindrical portion 36.

  Further, in the lower end portion of the lower guide cylindrical portion 36, a portion adjacent to the upper portion of the intermediate valve seat portion 14b is formed with a circulation lower opening 36a at a plurality of locations at intervals in the circumferential direction. The upper part of the guide cylindrical part 36 is adjacent to the lower part of the lower diameter-expanded part 35b of the intermediate guide cylindrical part 35, and a circulation upper opening 36b is formed at a plurality of positions at intervals in the circumferential direction. Yes. At the lower end opening of the lower guide cylindrical portion 36 (lower end opening of the first liquid piston 14), as described above, the sliding rod portion 19b of the rod-shaped valve body 19 having the lower liquid on-off valve 19a at the lower end portion is provided at the lower guide. The cylinder portion 36 is slidably inserted in a liquid tight contact state along the inner peripheral surface of the cylindrical portion 36.

  As shown in FIGS. 5A and 5B, the second liquid piston 15 is provided with a notch cylindrical mounting portion 15b that is slidably mounted along the outer peripheral surface of the lower guide cylindrical portion 36 as a guide. And a liquid chamber projecting portion 15c provided to project outward from the lower end portion of the cutout cylindrical mounting portion 15b. In the present embodiment, the cutout cylindrical mounting portion 15 b is a substantially cylindrical portion having an inner diameter similar to the outer diameter of the lower guide cylindrical portion 36. The cut-out cylindrical mounting portion 15b has a cut-out portion 15d cut into a vertically long band from the upper end surface to a position close to the liquid chamber overhanging portion 15c at the lower end portion, preferably in the circumferential direction, etc. It is formed at three positions with an angular interval. The cutout cylindrical mounting portion 15b is arranged so that each cutout portion 15d overlaps with the flow lower opening 36a formed in the lower guide cylindrical portion 36 at the lower end portion thereof, and at the upper end portion thereof. Is mounted on the lower guide cylindrical portion 36 in a state of being disposed so as to overlap the upper circulation opening 36b.

  The liquid chamber overhanging portion 15c is a portion that is continuously extended in an annular shape by projecting integrally from the outer peripheral surface of a portion near the lower side of the notch 15d at the lower end of the notch cylindrical mounting portion 15b. . A lower liquid chamber contact outer peripheral portion 15a that closely slides along the inner peripheral surface of the lower diameter-expanded portion 28b of the liquid cylinder 28 is integrally formed at the peripheral portion at the tip of the liquid chamber overhanging portion 15c. The lower liquid chamber contact outer peripheral portion 15a has an approximately U-shaped cross-sectional shape having an upper contact piece and a lower contact piece, which is bent outward with a connection portion with the liquid chamber overhanging portion 15c as a bent portion. The upper contact piece and the lower contact piece are elastically deformed, and these tip portions are brought into close contact with the inner peripheral surface of the lower diameter-expanded portion 28b of the liquid cylinder 28 so as to exhibit a strong sealing function of a double structure. It has become. The portion projecting downward from the liquid chamber overhanging portion 15c at the lower end portion of the cutout cylindrical mounting portion 15b is preferably provided so as to protrude outward from the outer peripheral surface of the lower end portion of the first liquid piston 14 together with the liquid chamber overhanging portion 15c. Further, an intermediate liquid on / off valve 15e is formed, which is in close contact with the intermediate valve seat portion 14b so as to be opened and closed.

  The rod-shaped valve body 19 is a solid, substantially cylindrical rod-shaped portion that includes a lower liquid on-off valve 19a that expands in diameter at the lower end portion of a rod-shaped sliding rod portion 19b. The sliding rod portion 19 b has an outer diameter similar to the inner diameter of the lower guide cylindrical portion 36 of the first liquid piston 14, and the inner portion of the lower guide cylindrical portion 36 is inserted through the lower end opening of the lower guide cylindrical portion 36. In a state where the outer peripheral surface is in liquid-tight contact with the peripheral surface, it is slidably inserted from the upper end side thereof toward the hollow interior of the lower guide cylindrical portion 36. Even at the top dead center of the pump head portion 12 (see FIG. 2), the sliding rod portion 19b is arranged so that the upper end of the sliding rod portion 19b is located above the circulation lower opening 36a formed in the lower guide cylindrical portion 36. It is inserted into the lower guide cylindrical part 36. Accordingly, the sliding rod portion 19b covers the inner opening surface of the flow lower opening 36a formed in the lower guide cylindrical portion 36 from the inner side, so that the lower liquid flow opening 36a is always closed from the inner side while keeping the lower liquid flow opening 36a closed from the inner side. It can slide in the axial direction along the inner peripheral surface of the guide cylindrical portion 36.

  In the present embodiment, the lower liquid on-off valve 19a of the rod-shaped valve body 19 is provided with a spring contact step portion 19c projecting annularly outward from the outer peripheral portion thereof. The spring contact step portion 19c is brought into contact with the lower end portion, and the upper end portion is brought into contact with the intermediate valve seat portion 14b provided at the lower end portion of the first liquid piston 14, so that the coiled spring member 29 is The rod-shaped valve body 19 is attached to the outer peripheral portion. The lower liquid on-off valve 19a of the rod-shaped valve body 19 is provided at the lower end portion of the lower diameter enlarged portion 28b of the liquid cylinder 28 when the first liquid piston 14 is pushed downward by a pressing operation to the pump head portion 19. It closely contacts the lower valve seat portion 28c. This makes it possible to block the inflow of the content liquid from the container main body 51 into the liquid cylinder 28 via the lower end inlet 28d below the lower diameter enlarged portion 28b.

  As described above, the air piston 16 disposed inside the hollow of the air cylinder 24 includes a cylindrical mounting portion 16b that is slidably mounted along the outer peripheral surface of the first liquid piston 14, and a cylindrical mounting portion 16b. And an air chamber overhanging portion 16c provided with an air chamber tight outer peripheral portion 16a at the peripheral edge, and further upward from the base end of the connection of the air chamber overhanging portion 16c to the cylindrical mounting portion 16b. An opening / closing ring portion 16d is provided.

  The cylindrical mounting portion 16b is a cylindrical portion having an inner diameter similar to the outer diameter of the intermediate guide cylindrical portion 35 of the first liquid piston 14, and is a loosely lightly attached to the outer peripheral surface of the intermediate guide cylindrical portion 35. In the fitted state, it can slide up and down along the outer peripheral surface of the intermediate guide cylindrical portion 35. The cylindrical mounting portion 16 b has a length slightly shorter than the length of the intermediate guide cylindrical portion 35 between the step contact portion 35 a and the lower end of the upper connecting cylindrical portion 34. The cylindrical mounting portion 16 b has its lower end surface in close contact with the step contact portion 35 a of the intermediate guide cylindrical portion 35, and the front end surface of the opening / closing ring portion 16 d is formed at the lower end portion of the connecting cylinder 31. The second air flow path 41b is opened away from the cut-out step surface of the abutted cut-out step groove 31c (see FIG. 5), and the lower end surface of the second air flow path 41b is brought into contact with the step of the intermediate guide cylindrical portion 35. The first air flow path 41a is spaced apart from the portion 35a, and is brought into close contact with the notch step surface of the contact notch step groove 31c formed at the lower end portion of the connection cylindrical body 31 while being separated from the portion 35a. And slides along the outer peripheral surface of the intermediate guide cylindrical portion 35 so that it can be switched between the opened state (see FIG. 3) and moves up and down with respect to the intermediate guide cylindrical portion 35. The slide can be moved relatively.

  In addition, an air circulation groove 43 through which air is circulated is formed in the inner surface of the cylindrical mounting portion 16b so as to extend in the vertical direction. By providing the air circulation groove 43, the air formed in the connecting cylinder 31 in a state where the lower end surface of the cylindrical mounting portion 16b is separated from the step contact portion 35a of the intermediate guide cylindrical portion 35. Along with the flow groove 42, a first air flow path 41a (see FIG. 3) extending from the lower air chamber 24a of the air cylinder 24 to the mixing chamber 13 can be formed.

  The air chamber overhanging portion 16c is an annular band plate-like portion provided so as to extend radially outward from the upper end portion of the cylindrical mounting portion 16b. An air chamber contact outer peripheral portion 16a that closely slides along the inner peripheral surface of the air cylinder 24 is integrally formed at the peripheral edge portion of the tip of the air chamber overhang portion 16c. By the air chamber overhanging portion 16c, the hollow interior of the air cylinder 24 is vertically divided in a state of being hermetically partitioned into a lower air chamber 24a and an upper air chamber 24b. The volume of these air chambers 24a and 24b is reduced or increased as the air chamber overhanging portion 16c moves up and down. The air chamber contact outer peripheral portion 16a has an approximately U-shaped cross-sectional shape having an upper contact piece and a lower contact piece that is bent outward with a connection portion with the air chamber overhanging portion 16c as a bent portion. By firmly deforming the close contact piece and the lower close contact piece and bringing these tips into close contact with the inner peripheral surface of the air cylinder 24, a strong sealing function of a double structure is exhibited.

  In the present embodiment, the air chamber overhanging portion 16c is provided so as to extend obliquely upward from the upper end portion of the cylindrical mounting portion 16b so as to overhang radially outward in a so-called banzai state. Therefore, for example, when water enters the upper air chamber 24b or the lower air chamber 24a of the air cylinder 24 from the outside, the water that has entered the center side where the open / close ring portion 16d and the intermediate guide cylindrical portion 35 are disposed. By making it easy to move and sending it out to the mixing chamber 13 together with the flow of air when discharging the content liquid, it becomes possible to make it into a foam and discharge it to the outside of the container.

  The open / close ring portion 16d is a cylindrical portion provided to extend upward from a base end portion of the air chamber overhanging portion 16c connected to the cylindrical mounting portion 16b. The opening / closing ring portion 16d is arranged such that the inner peripheral surface thereof is preferably separated from the inner peripheral surface of the cylindrical mounting portion 16b by the same degree as the thickness of the upper connecting cylindrical portion 34 of the first liquid piston 14. It is provided concentrically with the cylindrical mounting portion 16b. As a result, the opening / closing ring portion 16d is inserted into the contact notch step groove 31c formed between the lower end portion of the connection cylinder 31 and the outer peripheral surface of the lower end portion of the upper connection cylindrical portion 34 of the first liquid piston 14 at the tip. The surface can be inserted to a depth at which the surface comes into close contact with the notch step surface.

  The cylinder part 17 which comprises the pump 18 of the foam discharger 10 with the piston part 20 which consists of the air piston 16, the 1st liquid piston 14, and the 2nd liquid piston 15 is the above-mentioned of the foam discharge container 50. A large-diameter air cylinder 24 disposed inside the mouth portion 52 of the container main body 51, and an upper diameter-reduced portion 28a and a lower diameter-expanded portion 28b provided continuously from the air cylinder 24 downward. A liquid cylinder 28 having a smaller diameter than that of the cylinder 24 is formed.

  In the present embodiment, as shown in FIG. 2, the outer peripheral surface of the air cylinder 24 is covered from the outside, and the cylindrical cover 37 holds a gap between the outer peripheral surface of the air cylinder 24. It is attached.

  In the present embodiment, the cylindrical covering body 37 has a substantially cylindrical shape having an inner diameter slightly larger than the outer diameter of the air cylinder 24, which protrudes inward from the inner surface of the upper end portion and is integrally provided with the air chamber lid portion 38. It is a part of. The cylindrical cover 37 is provided with an annular connecting piece 37a that is bent outward from the upper end. The annular connecting piece 37 a is fitted into a connecting concave fitting portion 11 b provided on the lower surface side of the ceiling portion 11 a of the cap portion 11, so that the cylindrical covering body 37 is firmly connected integrally to the cap portion 11. In the present embodiment, the air cylinder 24 and the liquid cylinder 28 provided below the air cylinder 24 are attached to the cap unit 11 while being supported by the cylindrical cover 37 that is firmly connected to the cap unit 11. Yes.

  In the present embodiment, the air cylinder 24 and the liquid cylinder 28 include a first molded product 39a in which the air cylinder 24 and the upper diameter-reduced portion 28a of the liquid cylinder 28 are integrally molded, and a lower diameter-expanded portion 28b of the liquid cylinder 28. It is formed by connecting together two parts with the 2nd molded product 39b which shape | molded. The first molded product 39a was formed by extending in a mortar shape obliquely downward from the lower end of the outer peripheral wall 24c toward the inside from the cylindrical outer peripheral wall 24c (see FIG. 2) of the air cylinder 24. The component includes a bottom wall portion 24d and an upper reduced diameter portion 28a that extends downward from the lower end portion of the bottom wall portion 24d and is formed in a cylindrical shape. In the present embodiment, the first molded product 39a further protrudes outward from the connection portion of the outer peripheral wall portion 24c of the air cylinder 24 with the bottom wall portion 24d, and the first connection base portion 24e extends in the circumferential direction. It is continuously provided in an annular shape.

  In the present embodiment, the bottom wall portion 24d of the air cylinder 24 by the first molded product 39a is formed to extend in a mortar shape obliquely downward from the lower end portion of the outer peripheral wall portion 24c, for example, When water enters the lower air chamber 24a of the air cylinder 24 from the outside, the invading water is easily moved to the center side where the cylindrical mounting portion 16b and the intermediate guide cylindrical portion 35 are arranged, and the content liquid It is possible to discharge the liquid into the mixing chamber 13 together with the air flow when it is discharged.

  A lower fitting recess 24f is formed on the upper surface of the first connection base portion 24e to be connected in a state where the lower end portion of the cylindrical covering body 37 is fitted. Further, the lower end of the air chamber lid portion 38 provided at the upper end portion of the cylindrical covering body 37 is connected in a state where the upper end portion of the outer peripheral wall portion 24c of the air cylinder 24 by the first molded product 39a is fitted. An upper insertion recess 38a is formed. The upper end of the outer peripheral wall 24c of the air cylinder 24 is fitted into the upper fitting recess 38a of the air chamber lid 38, and the lower end of the cylindrical cover 37 is fitted into the lower part of the first connection base 24e of the first molded product 39a. The first molded product 39a is supported by the cylindrical covering body 37 in a state where a space is maintained between the cylindrical covering body 37 and the outer peripheral wall portion 24c of the air cylinder 24 by being fitted into the recessed portions 24f. Are firmly connected to the cylindrical covering body 37 integrally.

  In the present embodiment, a plurality of auxiliary vents 25c are provided in the air chamber lid portion 38 above the space between the cylindrical cover 37 and the outer peripheral wall portion 24c of the air cylinder 24 at intervals in the circumferential direction. It is provided in the place. Lower air chamber vents 25a are provided at a plurality of locations at intervals in the circumferential direction at the lower end portion of the outer peripheral wall portion 24c of the air cylinder 24 adjacent to the first connection base portion 24e. Upper air chamber vents 25b are provided at a plurality of locations at intervals in the circumferential direction in a portion adjacent to the outer peripheral surface of the connecting cylinder 31 of the air chamber lid portion 38. Each of the lower air chamber vent 25a and the upper air chamber vent 25b is covered so as to be openable and closable from the inside, allowing air to flow into the lower air chamber 24a and the upper air chamber 24b, and the lower air chamber 24a and the upper air chamber. Check valves 26a and 26b are provided to block outflow of air from 24b to the outside.

  Further, in the present embodiment, the first molded product 39a extends downward from the bottom wall portion 24d of the air cylinder 24 in a cylindrical shape, and is disposed outside the upper reduced diameter portion 28a of the liquid cylinder 28 with a gap. A connecting cylinder 44 is provided. The connecting cylindrical portion 44 is disposed concentrically with the upper reduced diameter portion 28a of the liquid cylinder 28, and continues downward from an intermediate portion of the bottom wall portion 24d of the air cylinder 24, and is substantially the same as the upper reduced diameter portion 28a. It is provided with the length. The connection cylindrical portion 44 has a lower end portion that protrudes outward from the upper end portion of the lower diameter-expanded portion 28b of the second molded product 39b of the liquid cylinder 28, and is provided in an annular shape continuously in the circumferential direction. By fitting into the lower fitting recess 43b formed on the upper surface of the base portion 43a, the liquid cylinder of the second molded product 39b is formed at the lower end portion of the upper reduced diameter portion 28a of the liquid cylinder 28 of the first molded product 39. 28, the lower diameter-expanded portion 28b is integrally connected.

  The second molded product 39b forms a substantially cylindrical lower enlarged portion 28b having a lower valve seat portion 28c having a reduced diameter at the lower end, which constitutes the liquid cylinder 28 together with the upper reduced diameter portion 28a of the first molded product 39a. It is a part to do. The lower diameter-expanded portion 28b of the second molded product 39b has a cylindrical portion that is a main portion thereof having an inner diameter similar to the outer diameter of the upper reduced-diameter portion 28a and the same inner diameter as that of the connecting cylindrical portion 44. It has an outer diameter. As a result, the thickness of the cylindrical portion of the lower diameter enlarged portion 28b is the same as the interval width between the upper reduced diameter portion 28a and the connecting cylindrical portion 44 of the first molded product 39a arranged concentrically. It has become. In addition, a second connection base 43a having an L-shaped cross-section projecting outward from a position slightly lowered from the upper end surface to the upper end of the lower diameter enlarged portion 28b of the second molded product 39b is provided in the circumferential direction. It is continuously provided in an annular shape. The second connection base portion 43a is a lower portion in which the lower end portion of the connection cylindrical portion 44 is fitted between the upper end portion of the lower diameter-expanded portion 28b by protruding so as to have an L-shaped cross-sectional shape that bends upward. A fitting recess 43b is formed.

  The lower fitting recessed portion 43b is fitted with the lower end portion of the connecting cylindrical portion 44 by the first molded product 39a, and the upper end portion of the lower diameter enlarged portion 28b is fitted to the lower end portion of the upper reduced diameter portion 28a by the first molded product 39a. And the lower part of the connecting cylindrical portion 44, the lower portion of the liquid cylinder 28 formed by the second molded product 39b is supported by the first molded product 39a in a state where the gap between the lower cylindrical portion 44 and the lower end of the connecting cylindrical portion 44 is fitted. The enlarged diameter portion 28b is firmly and integrally connected as a portion having an inner diameter larger than that of the upper reduced diameter portion 28a.

  In addition, a lower valve seat portion 28c having an inner diameter smaller than that of a cylindrical portion that is a main portion is provided at the lower end portion of the lower diameter-expanded portion 28b of the liquid cylinder 28 by the second molded product 39b. As described above, the lower liquid on-off valve 19a of the rod-shaped valve body 19 is in close contact with the lower valve seat portion 28c so that it can be opened and closed. The lower end portion of the lower enlarged portion 28b of the liquid cylinder 28 extends further downward from the lower valve seat portion 28c, and the lower end surface opens as a lower end inflow port 28d. An introduction tube portion 28e is provided for introducing the content liquid into the tube.

  And according to the foam dispenser 10 of this embodiment provided with the above-mentioned structure, the pump head part from the state in which the pump head part 12 is located in a top dead center before pressing the pump head part 12 shown in FIG. When the operation of pushing down 12 is performed, the first liquid of the cylindrical mounting portion 16b of the air piston 16 has a close contact force between the air chamber close outer peripheral portion 16a of the air piston 16 and the inner peripheral surface of the air cylinder 24. Since the adhesion force to the outer peripheral surface of the piston 14 and the adhesion force of the upper liquid chamber adhesion outer peripheral portion 14a of the first liquid piston 14 to the inner peripheral surface of the upper reduced diameter portion 28a of the liquid cylinder 28 are larger. First, the cylindrical mounting portion 16b of the air piston 16 slides upward relative to the outer peripheral surface of the first liquid piston 14 as the first liquid piston 14 moves slightly downward. That (see Fig. 3).

  As a result, the air piston 16 causes the lower end surface of the cylindrical mounting portion 16b before pressing the pump head portion 12 to be in close contact with the step contact portion 35a of the intermediate guide cylindrical portion 35, and the opening / closing ring portion. From the state in which the tip end surface of 16d is separated from the notch step surface of the contact notch step groove 31c formed in the lower end portion of the connecting cylinder 31 (see FIG. 2), the lower end surface of the cylindrical mounting portion 16b is moved to the middle. The tip end surface of the opening / closing ring portion 16d is brought into close contact with the notch step surface of the contact notch step groove 31c formed in the lower end portion of the connecting cylinder 31. The state is switched to the state (see FIG. 3). In addition, the first air flow path from the lower air chamber 24a to the mixing chamber 13 through the air circulation groove 43 formed in the cylindrical mounting portion 16b and the air circulation groove 42 formed in the connection cylinder 31 is thereby achieved. 41a is opened.

  Further, the close contact force of the lower liquid chamber contact outer peripheral portion 15 a of the second liquid piston 15 with respect to the inner peripheral surface of the lower diameter expanded portion 28 b of the liquid cylinder 28 is greater than that of the notch cylindrical mounting portion 15 b of the second liquid piston 15. Since the lower guide cylindrical portion 36 is larger than the adhesion force to the outer peripheral surface, the notched cylindrical mounting portion 15b of the second liquid piston 15 is moved slightly downward by the lower guide cylindrical portion 36. It slides upward relative to the outer peripheral surface of the lower guide cylindrical portion 36 (see FIG. 3).

  As a result, the second liquid piston 15 uses the intermediate liquid on / off valve 15e at the lower end of the cut-out cylindrical mounting part 15b before pressing the pump head part 12 as the lower end of the lower guide cylindrical part 36 of the first liquid piston 14. From the state (see FIG. 2) in which the upper end surface of the cutout cylindrical mounting portion 15b is spaced apart from the lower end enlarged diameter portion 35b of the intermediate guide cylindrical portion 35. The lower end surface of the cylindrical mounting portion 15 b is separated from the intermediate valve seat portion 14 b of the lower guide cylindrical portion 36, and the upper end surface of the notched cylindrical mounting portion 15 b is connected to the lower end enlarged diameter portion 35 b of the intermediate guide cylindrical portion 35. It switches to the state (refer FIG. 3) closely_contact | adhered to the lower end surface. This also causes the upper diameter-reduced portion 28a to extend from the lower diameter-expanded portion 28b of the liquid cylinder 28 through the flow lower opening 36a formed at the lower end portion of the lower guide cylindrical portion 36 and the notched portion 15d of the notched cylindrical mounting portion 15b. To the flow path inside the first liquid piston 14 through a flow upper opening 36b formed at the upper end of the lower guide cylindrical part 36, and further, while pushing up the ball valve 33, from the liquid outlet 34b to the mixing chamber The first liquid flow path 40a reaching 13 is opened.

  If the pump head portion 12 is pushed further downward from the state in which the first liquid passage 40a and the first air passage 41a are opened in this way, the first liquid piston 14 is lowered as shown in FIG. Accordingly, the lower liquid opening / closing valve 19a at the lower end portion of the rod-shaped valve body 19 is in close contact with the lower valve seat portion 28c provided at the lower end portion of the lower diameter expanding portion 28b of the liquid cylinder 28, so that the lower diameter expanding portion 28b. Is closed, and the liquid content stored in the liquid cylinder 28 is pushed out and sent out to the mixing chamber 13 via the first liquid flow path 40a. Further, as the air piston 16 descends, the lower air chamber vent 25a provided in the lower air chamber 24a is closed by the check valve 26a, and the air inside the lower air chamber 24a is pushed out, It is sent out to the mixing chamber 13 through the first air flow path 41a.

  The content liquid and air sent to the mixing chamber 13 are mixed in the mixing chamber 13 and foamed into a foam shape by passing through the foam generating member 30, and then the tip of the pump head portion 12 through the foaming channel 21. From the discharge port 12a.

  Further, as the air piston 16 descends, the upper air chamber 24b of the air cylinder 24 becomes negative pressure, so that the check valve 26b that opens and closes the upper air chamber vent 25b provided in the upper air chamber 24b is opened. Thus, for example, the external air may be formed between a gap between the skirt-like cover 27 of the pump head portion 12 and the guide stem 23 of the cap portion 11, or between the guide stem 23 of the cap portion 11 and the hollow pipe 22 or the connecting cylinder 31. It flows into the inside of the upper air chamber 24b from the upper air chamber vent 25b through a gap therebetween.

  In such a forward path in which the pump head portion 12 is pushed downward, the discharge of the content liquid made into a foam by mixing with air is performed, for example, by the lower end of the skirt-like cover 27 of the pump head portion 12 shown in FIG. By contacting the ceiling portion 11a of the cap portion 11, the pump head portion 12 can be continuously performed until reaching the bottom dead center where the pump head portion 12 can no longer be pushed down.

  And the foam discharger 10 of this embodiment is the pump head part pushed in by releasing the press to the pump head part 12, for example from the state where the pump head part 12 shown in FIG. 4 is located at the bottom dead center. 12 also has a function of mixing the content liquid with air and discharging it in the form of bubbles in the return path which is pushed back upward by the action of the biasing force of the spring member 29 that has been compressed and deformed.

  That is, according to the foam discharger 10 of the present embodiment, when the pressure on the pump head portion 12 is released, the air chamber close outer peripheral portion 16a of the air piston 16 with respect to the inner peripheral surface of the air cylinder 24 as described above. The close contact force is the close contact force of the cylindrical mounting portion 16b of the air piston 16 to the outer peripheral surface of the first liquid piston 14, and the upper portion of the liquid cylinder 28 of the upper liquid chamber close peripheral portion 14a of the first liquid piston 14. Since the contact force with respect to the inner peripheral surface of the reduced diameter portion 28a is greater, the first mounting piston 16b of the cylindrical piston mounting portion 16b of the air piston 16 is slightly lifted upward by the biasing force of the spring member 29. Is moved to slide downward relative to the outer peripheral surface of the first liquid piston 14 (see FIG. 5).

  As a result, the air piston 16 separates the lower end surface of the cylindrical mounting portion 16b from the step contact portion 35a of the intermediate guide cylindrical portion 35 before releasing the pressure to the pump head portion 12 and opens and closes the opening / closing ring. From the state in which the tip surface of the portion 16d is brought into close contact with the notch step surface of the contact notch step groove 31c formed in the lower end portion of the connecting cylinder 31 (see FIG. 4), the lower end surface of the cylindrical mounting portion 16b Is in close contact with the step contact portion 35 a of the intermediate guide cylindrical portion 35, and the notch step of the contact notch step groove 31 c formed at the lower end portion of the connecting cylinder 31 is formed on the front end surface of the opening / closing ring portion 16 d. The state is switched to a state separated from the surface (see FIG. 5). In addition, the first air flow path from the lower air chamber 24a to the mixing chamber 13 through the air circulation groove 43 formed in the cylindrical mounting portion 16b and the air circulation groove 42 formed in the connection cylinder 31 is thereby achieved. 41 a is closed, and the second air flow path 41 b extending from the upper air chamber 24 b to the mixing chamber 13 through the air circulation groove 42 formed in the connection cylinder 31 is opened.

  Further, as described above, the close contact force of the lower liquid chamber contact outer peripheral portion 15a of the second liquid piston 15 with respect to the inner peripheral surface of the lower diameter enlarged portion 28b of the liquid cylinder 28 is notched cylinder of the second liquid piston 15. Since the cylindrical mounting portion 15b is larger than the adhesion force with respect to the outer peripheral surface of the lower guide cylindrical portion 36, the notched cylindrical mounting portion 15b of the second liquid piston 15 has the lower guide cylindrical portion 36 slightly upward. By moving, it slides downward relative to the outer peripheral surface of the lower guide cylindrical portion 36 (see FIG. 3).

  Thereby, the second liquid piston 15 separates the lower end surface of the notched cylindrical mounting portion 15b from the intermediate valve seat portion 14b of the lower guide cylindrical portion 36 before releasing the pressure to the pump head portion 12; From the state in which the upper end surface of the notched cylindrical mounting portion 15b is brought into close contact with the lower end surface of the lower end enlarged diameter portion 35b of the intermediate guide cylindrical portion 35 (see FIG. 4), the lower end portion of the notched cylindrical mounting portion 15b is changed. The intermediate liquid on-off valve 15e is brought into close contact with the intermediate valve seat part 14b at the lower end of the lower guide cylindrical part 36 of the first liquid piston 14, and the upper end surface of the notched cylindrical mounting part 15b is connected to the intermediate guide cylindrical part. It switches to the state (refer FIG. 5) spaced apart from the lower end enlarged diameter part 35b of 35. Further, the intermediate liquid on-off valve 15e at the lower end of the cutout cylindrical mounting portion 15b is in close contact with the intermediate valve seat portion 14b, whereby the first liquid flow from the lower diameter enlarged portion 28b of the liquid cylinder 28 to the upper diameter reduced portion 28a. The passage 40a is closed, and the upper reduced diameter portion 28a leads to a flow passage inside the first liquid piston 14 through a flow upper opening 36b formed at the upper end portion of the lower guide cylindrical portion 36. Further, the ball valve The second liquid flow path 40 b extending from the liquid outlet 34 b to the mixing chamber 13 is held while pushing up 33.

  When the pump head portion 12 is further pushed back by the biasing force of the spring member 29 from the state in which the second liquid passage 40b and the second air passage 41b are opened in this way, as shown in FIG. The lower part of the second liquid piston 15 provided at the lower end portion of the notched cylindrical mounting portion 15b while the intermediate liquid on-off valve 15e at the lower end portion of the notched cylindrical mounting portion 15b is kept in close contact with the intermediate valve seat portion 14b. The liquid chamber contact outer peripheral portion 15a slides upward while being in close contact with the inner peripheral surface of the lower diameter expanded portion 28b of the liquid cylinder 28.

  Here, the cross-sectional area inside the hollow of the upper diameter-reduced portion 28a above the lower diameter-expanded portion 28b of the liquid cylinder 28 where the lower liquid chamber contact outer peripheral portion 15a slides is greater. Therefore, as the lower liquid chamber contact outer peripheral portion 15a moves upward, the upper liquid chamber at the lower end portion of the intermediate guide cylindrical portion 35 that is in close contact with the inner peripheral surface of the upper reduced diameter portion 28a. The upper diameter-reduced portion 28a and the lower diameter-expanded portion in the portion between the tight outer peripheral portion 14a and the lower liquid chamber tight outer peripheral portion 15a at the lower end of the second liquid piston 15 that is in close contact with the inner peripheral surface of the lower enlarged portion 28b. The volume inside the hollow portion 28b is reduced. Since the volume of the hollow interior of the upper reduced diameter portion 28a and the lower enlarged diameter portion 28b in the portion between the upper liquid chamber close outer peripheral portion 14a and the lower liquid chamber close outer peripheral portion 15a is reduced, it is stored in these. The content liquid which has been pushed out is pushed out and sent out to the mixing chamber 13 through the second liquid channel 40b.

  The upper air chamber vent 25b provided in the upper air chamber 24b is lifted by the check valve 26b as the air piston 16 is brought into close contact with the inner peripheral surface of the air cylinder 24. In addition to being blocked, the air inside the upper air chamber 24b is pushed out and sent out to the mixing chamber 13 via the second air flow path 41b.

  After the content liquid and air sent out to the mixing chamber 13 are mixed in the mixing chamber 13 and passed through the foam generating member 30 in the same manner as the forward path in which the pump head portion 12 is pushed downward, the foam and foam are foamed. Then, the liquid is discharged from the discharge port 12 a at the tip of the pump head portion 12 through the foaming channel 21.

  Further, as the air piston 16 rises, the lower air chamber 24a of the air cylinder 24 becomes negative pressure, so that the check valve 26a for opening and closing the lower air chamber vent 25a provided in the lower air chamber 24a is opened. Thus, for example, the external air may be formed between a gap between the skirt-like cover 27 of the pump head portion 12 and the guide stem 23 of the cap portion 11, or between the guide stem 23 of the cap portion 11 and the hollow pipe 22 or the connecting cylinder 31. After passing through the gap between them and flowing into the space between the cylindrical cover 37 and the outer peripheral wall 24c of the air cylinder 24 via the auxiliary vent 25c formed in the air chamber lid 38, the lower air The air flows into the lower air chamber 24a from the chamber vent 25a.

  Further, as the first liquid piston 14 is raised, the inside of the lower enlarged portion 28b of the liquid cylinder 28 at a portion below the intermediate valve seat portion 14b and the lower liquid chamber contact outer peripheral portion 15a becomes negative pressure. The lower liquid on-off valve 19a of the rod-shaped valve body 19 is released from the lower valve seat portion 28c of the liquid cylinder 28, and the content liquid is supplied to the container body 51 via the introduction cylinder portion 28e whose lower end surface opens as a lower end inlet 28d. To the inside of the lower enlarged portion 28b of the liquid cylinder 28.

  In such a return path in which the pump head portion 12 that has been pushed in is pushed back upward by the action of the spring member 29, the discharge of the liquid content made into foam by mixing with air is shown in FIG. The annular stopper rib 31b provided at the upper end portion of 31 is in contact with the annular contact rib 23a provided at the upper end portion of the guide stem 23 from below, until the top dead center of the pump head portion 12 is reached. Will be done.

  Therefore, according to the foam discharger 10 of the present embodiment, not only in the forward path where the pump head part 12 is pushed, but also in the return path where the pushed pump head part 12 is pushed back upward by the action of the spring member 29. Can be mixed with air to be discharged in the form of foam.

  In addition, for example, it is possible to improve the degree of freedom in designing the expansion ratio of the content liquid, to reduce the diameter of the foam discharger 10 and the foam discharge container 50, and to increase the width of the appearance design and usage scenes. Become.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, it is not always necessary to install an air cylinder or a liquid cylinder by covering the outer peripheral surface of the air cylinder from the outside and attaching a cylindrical cover, and supporting the cylindrical cover. They can also be connected directly. By covering the outer peripheral surface of the air cylinder from the outside and attaching the cylindrical cover, it is more effective for the liquid inside the container body to flow into the air cylinder through the vents, etc. Can be avoided. Further, it is not always necessary that the connecting cylindrical portion is provided outside the upper diameter-reduced portion of the liquid cylinder, and the biasing means may be other than the spring member provided in the lower diameter-expanded portion of the liquid cylinder. good.

10 Foam dispenser (pump former)
11 Cap part 12 Pump head part 12a Discharge port 13 Mixing chamber 14 First liquid piston 14a Upper liquid chamber contact outer peripheral part 14b Intermediate valve seat part 15 Second liquid piston 15a Lower liquid chamber close outer peripheral part 15b Notch cylindrical mounting part 15c Liquid Chamber overhang 15d Notch 15e Intermediate liquid on-off valve 16 Air piston 16a Air chamber tight outer periphery 16b Cylindrical mounting portion 16c Air chamber overhang 16d Open / close ring 17 Cylinder 18 Pump 19 Rod valve 19a Lower liquid on / off valve 19b Slide Moving rod portion 20 Piston portion 21 Foam channel 22 Hollow pipe 23 Guide stem 24 Air cylinder 24a Lower air chamber 24b Upper air chamber 25a Lower air chamber vent 25b Upper air chamber vents 26a, 26b Check valve 28 Liquid cylinder 28a Upper Reduced diameter portion 28b Lower diameter expanded portion 29 Energizing means (spring member)
30 Foam generating member 33 Ball valve 37 Tubular covering body 40a First liquid flow path 40b Second liquid flow path 41a First air flow path 41b Second air flow path 50 Foam discharge container (pump former container)
51 Container body 52 Mouth

Claims (2)

It has a pump head part that is attached to the mouth part of the container body via a cap part and is provided so as to be able to reciprocate with respect to the cap part. By pressing the pump head part, the contents can be stored in the mixing chamber. A bubble discharger that opens a liquid flow path for sending liquid and an air flow path for sending air to the mixing chamber, and foams and discharges the content liquid sent to the mixing chamber from the mixing chamber to the discharge port Because
A cylinder portion including a large-diameter air cylinder disposed in the container main body, and a small-diameter liquid cylinder including an upper diameter-reduced portion and a lower-diameter enlarged portion provided continuously from the air cylinder; ,
An air piston having an air chamber tight outer periphery that closely slides along the inner circumferential surface of the air cylinder, and an upper liquid chamber tight outer periphery that slides along the inner peripheral surface of the upper diameter-reduced portion of the liquid cylinder. A second liquid piston including a first liquid piston having a liquid flow passage on the inside, and a lower liquid chamber close outer periphery that slides in close contact with an inner peripheral surface of the lower enlarged portion of the liquid cylinder. And a piston portion including
The air piston has a cylindrical mounting portion that is slidably mounted along the outer peripheral surface of the first liquid piston, and the air chamber is closely attached to a peripheral portion provided to protrude outward from the cylindrical mounting portion. An air chamber overhanging portion having an outer periphery, and by the air chamber overhanging portion, the hollow interior of the air cylinder is partitioned into a lower air chamber and an upper air chamber,
The second liquid piston is slidably mounted along the outer peripheral surface of the portion of the first liquid piston disposed in the liquid cylinder, and has a cutout cylindrical mounting having a cutout portion for circulating the content liquid. And a liquid chamber overhanging portion provided on the outer periphery with the lower liquid chamber adhesion outer peripheral portion provided to project outward from the notched cylindrical mounting portion, and the lower end portion of the notched cylindrical mounting portion is It is an intermediate liquid on-off valve that is in close contact with the intermediate valve seat provided to protrude outward from the outer peripheral surface of the lower end of the first liquid piston,
At the lower end opening of the first liquid piston, there is a sliding rod portion of a rod-shaped valve body provided with a lower liquid opening / closing valve at the lower end portion, which is in close contact with a lower valve seat portion provided at the lower end portion of the liquid cylinder. , And is slidably inserted in a liquid tight contact state along the inner peripheral surface of the first liquid piston,
The lower air chamber and the upper air chamber of the air cylinder are each formed with a vent for introducing air into the air chamber, and covers the vent so as to be openable and closable from the inside. Check valves that allow the inflow of air into the chambers and block the outflow of air from these air chambers to the outside are provided.
And the foam discharger provided with the urging means which urges | biases upwards so that the said pump head part may be returned to an original state, when the said pump head part is pressed.   The foam discharger according to claim 1, wherein the outer peripheral surface of the air cylinder is covered from the outside, and the cylindrical covering body is attached in a state where a gap is held between the outer peripheral surface and the outer peripheral surface.

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